adaptive optics system and infrared instrumentation for the shane 3-meter telescope
DESCRIPTION
Adaptive Optics System and Infrared Instrumentation for the Shane 3-meter Telescope. UCO/Lick Observatory University of California. Presented to the UCOAC Meeting May 6, 2012. Laboratory for Adaptive Optics UCO/Lick Observatory. Context of ShaneAO Adaptive Optics at Lick Observatory. - PowerPoint PPT PresentationTRANSCRIPT
Adaptive Optics System and Infrared Instrumentation
for the Shane 3-meter Telescope
UCO/Lick Observatory
University of California
Laboratory for Adaptive OpticsUCO/Lick Observatory
Presented to the UCOAC Meeting May 6, 2012
Context of ShaneAOAdaptive Optics at Lick Observatory
• Keck Next Generation Adaptive Optics (KNGAO)– Design effort 2006-2010– Reached PDR; on hold pending funding; spin-off efforts: new
laser, on-axis LGS projection telescope, IR Tip/Tilt
• Visible Light Laser Guidestar Experiment (Villages)– Research effort 2010; Nickel telescope– First on-sky demonstration of MEMS and “open-loop” control
– tip/tilt start sharpening in NGAO, vector to MOAO/IRMOS
2
ShaneAO: Adaptive Optics System at the Shane 3-meter Telescope(LGS mode, new fiber laser)
• ShaneAO is a diffraction-limited imager, spectrograph, and polarimeter for the visible and near-infrared science bands.
3
• Adaptive optics corrects for the nominally ~1 arcsecond seeing blur to the diffraction limit over a field of view known as the isoplanatic patch
0 2 4 6 8 10 12 140.0
0.2
0.4
0.6
0.8
1.0
Field Angle , arcsec
Strehl
Z
J
H
K
Band
0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
0.02
0.05
0.10
0.20
0.50
1.00
Wavelength , microns
FWHM,arcseconds
Pixel
DiffLim
Seeing
Strehl
4
Airy core forming
LGS mode, new fiber laser
ShaneAO instrument characteristics
5
Detector sampling 0.035 arcsec/pixelField of view 20 arcsec squareScience detector: Hawaii2RG Hawaii2RGScience wavelength coverage: 0.7 to 2.2 microns 0.7 to 2.2 micronsSpectral resolution R = 500Slit width: 0.1 arcseconds 0.1 arcsecSlit decker: 10 arcseconds (?) 10 arcsecSlit angle on sky adjustable 0-360°Long-exposure stability hold to the diffraction-limit for one hour
hold to ½ slit width for 4 hoursPolarimitry mode: polarization analyzer and variable angle waveplateDelta magnitude within seeing disk DmK=10
Minimum brightness tip/tilt star: mV=18
Tip/tilt star selection field 120 arcsecSky coverage ~90% LGS modeMinimum brightness natural guide star mV=13
Camera readout modes Correlated double-sampling (CDS)up the ramp (UTR)sub-frame region of interest (ROI)quick take
Exposure support: Multiple frame co-addedautomated nod and expose coordinated with telescope (snap-i-diff, box-4, box-5)automated darks sequence based of history of science exposures
Observations support automatic data loggingautomatic data archiving
Comparison: current AO + IRCAL vs. ShaneAO + ShARCS
5-sigma limiting magnitude for point sources300s exposures, Fowler-32 reads, flux in Airy core:
Much of the difference between this model and ideal design predictions is the model’s reduced reflective coating transmission & increase in dust contamination to match IRCAL backgrounds and sensitivity. ShaneAO may yet do better.
Punchline: Speed gain of a factor of 13.2 in Ks, K (time to fiducial S/N at fixed mag.)
Ks Strehl: (IRCAL NGS + LGS values from Olivier et al. 1999)
0.65 (NGS)
0.42 (LGS)
0.8 (LGS)
20% gain w/better NIR filters!
Long exposures should be possible for spectroscopyMechanical engineering effort to reduce flexureDetector improvements
Better mechanical design to make alignment more robust, require less human intervention. Keep ShaneAO clean! need 3x more dust contamination for our IRCAL model than required by NGAO to match observed data
ShaneAO Technology development connection to Keck NGAO
• MEMS deformable mirror• Fiber laser tuned to atomic sodium transitions (optical pumping,
re-pump line)• Control system: woofer-tweeter, wind-predictive• Other opto-mechanical stability design improvements
8
In the next few years, ShaneAO is the *only LGS-AO system* being planned (in the world) that will have the kind of low wavefront errors being contemplated by TMT NFIRAOS.
Thus ShaneAO is a TMT pathfinder in the system performance aspect, in addition to in the individual components.
ShaneAO Science Application
9
Crowded field imaging: Star counts, metallicity and ages in clusters within our Galaxy Star counts in Andromeda galaxy Astrometry – tracking the orbits of stellar companions
Detailed imaging of nebula and galaxies Gas and dust disks around young stars Multiple star systems in star forming regions Velocity dispersion of galaxies hosting active galactic nuclei Morphological detail of quasar host galaxies Details of morphology of merging galaxies
Exoplanets and planet formation statistics Follow up to radial velocity planetary systems (stellar companions) Follow up to Kepler survey stars (companions) Precursory work for Gemini Planet Imager target stars
Solar system Composition and orbital parameters of Kuiper belt objects Composition and orbital parameters of asteroids and asteroid moons Details of gas-giant ring structure and positions of ring-shepherding moons Details and evolution of gas-giant weather
Star-forming regions - polarimetry
Updated ShaneAO Implementation Schedule
• AO system first light tests – Fall 2013• IRCAL -> Sharcs mechancial conversion – Winter 2013• Sharcs first light – Spring 2014• Fiber laser first light – Summer 2014• 30x mode upgrade – Early 2015• Graduate student project: laser uplink correction
10
Optomechanical Architecture
11
Cassegrain mount “Woofer-tweeter” architectureClosed-loop AOPartially corrected TT star
ShaneAO components in the lab
12
Deformable Mirror
Wavefront Sensor Science Detector
Laser Arrival at UCSC
13
More information
14
• Yearly Project Reports to the NSF: 2010 2011 2012
• Design Review Presentation (April, 2012)• ShaneAO Document
• http://lao.ucolick.org/ShaneAO